We present the first near-infrared images of the two massive southern
star-forming regions G11.11-0.40 and G341.21-0.21, obtained with adaptive
optics at sub-arcsecond resolution. Together with conventional narrow-band
near-infrared images and polarization maps, mid-infrared data, millimetre
and radio data, we were able to determine the morphological structure
and to constrain the stellar content of the regions. In both cases the
molecular cloud cores have masses of about 500 and contain clusters
of OB stars. This supports the view that massive stars do not form in
isolation. In the case of G11.11-0.40 we could identify the central
O star responsible for the ionization of the ultracompact Hii region.
Our results for G341.21-0.21 indicate that this source is a
precursor of an ultracompact Hii region.

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